Some apps are popular because they’re useful or solve a problem. Others are popular because they’re the Kardashians of apps: they’re famous for being famous. Everyone else is using them, or because they have a big budget and “growth hackers” on staff tasked with building mind share for their company. Before you sign…

The holiday season is over, so it's time to get serious about your New Year's resolutions. But those fine intentions are only as good as your self-control. Here's what you need to know about the neuroscience of willpower — and what you can do to make your will even stronger.

Can you turn over a new leaf, go on a diet, learn a new language, and get up every morning at dawn to meditate and clean your house? The idea of ego depletion says, "no." And it has physical evidence to back that up.

Weight loss is tricky business. Obviously what you eat has a huge impact on your health and body weight. But anyone who has ever tried to modify their diet for the sake of losing weight knows it isn’t so simple.